Pivoted sweep abm bender with



H. W. ENGLISH Dec. 27, 1949 PIVOTED SWEEP ARM BENDER WITH WORK-CLAMPING JAW AND NESTED SLEEVES ON FULCRUM File i Oct. 26, 1945 2 Sheets-Sheet 1 Dec. 27,1949

H. W. ENGLISH PIVOTED SWEEP ARM BENDER WITH WORK-CLAMPING JAW AND NESTED SLEEVES ON FULCRUM Filed Oct. 26, 1945 2 Sheets-Sheet 2 Patented Dec. 27, 1949 PIVOTED SWEEP ARM BENDER WITH WORK-CLAMPING J AW ON FULCRUM SLEEVES AND NESTED Harvey W. English, Portland, Oreg.

Application October 26, 1945, Serial No. 624,741

3 Claims.

This invention relates to bending devices, and more particularly to an apparatus for bending bars to form rings, U-bolts, or the like.

A main object of the invention is to provide a novel and improved bending apparatus which is very simple in structure and which is extremely easy to operate.

A further object of the invention is to provide an improved bending device for bending bars into ring shape or to form U-bolts, said device being extremely simple in construction and being very efficient in operation, and being further provided with readily interchangeable means for adjusti'ng the device to bend bars to a curvature of desired radius.

Further objects and advantages of the invention will appear from the following description and claims and from the accompanying drawings, wherein:

Figure 1 is a top plan view of a bending device constructed in accordance with this invention.

Figure 2 is a side elevational view of the bending device of Figure 1.

Figure 3 is a top plan view of the main body portion of a movable die supporting member employed in the device of Figure 1.

Figure 4 is an end elevational view of the die supporting member of Figure 3.

Figure 5 is an end elevational view of the supporting base member employed in the bending device of Figure 1.

Figure 6 is a side elevational view of a movable jaw member employed in the device of Figure 1.

Figure '7 is an end elevational view of the jaw member of Figure 6. V

Figure 8 is an end elevational view of a die carrier employed with the die supporting member of Figure 3.

Figure 9 is a side elevational view of a. stationary die supporting member employed in the device of Figure 1.

Figure 10 is a side elevational view of a U-bolt gauge member employed with the device of Figure 1.

Figure 11 is a top plan view of the U-bolt gauge device of Figure 10.

Figure 12 is a side elevational view of a removable stationary die employed with the die supporting member of Figure 9.

Referring to the drawings, designates a supporting base'member for the bending apparatus. Member is adapted to be rigidly secured to an appropriate stationary support, as, for example, a bench vise mounted on a shop bench. Member I I is formed with a depending longitudinally extending central portion l2 adapted to be received between the jaws of a bench vise or similar clamping device. Member If is further formed with a horizontal table portion I3 and a pair of lug ele ments I4 and I5 formed to define a longitudinal dovetailed channel I6. Member II is also formed with a vertical internally threaded bore whose axis lies in the central longitudinal vertical plane of channel I6. I

Threadedly received in bore I1 is the lower threaded end I8 of a die supporting member I9, shown in Figure 9. Member I9 comprisesa vertie cal shank portion or fulcrum member 20 and a horizontal shaft member 2|. The lower portion 7 of shank 20 is formed with a bearing portion 22 and a laterally projecting rib element 23. The upper portion of shank 20 is formed with a bearing portion 24 and a peripheral groove 25, the top end of the shank 20 being tapered to a point 26.

Pivotally secured to member [9 at the respective bearing surfaces 22 and 24 is a movable die supporting member 21 comprising a main body portion 28, shown in Figures 3 and 4, having hinged thereto a movable top member 29 by a horizontal hinge pin 30. Top member 29 "is adapted to be rotatively engaged with bearing surface 24 and to be releasably secured in operative position by a latch member 3| which is biased by a spring 32 to an interlocking relationship with groove '25. The main body portion 28 of movable die supporting member 21 is secured in position with respect to table I3 by the overlying rib elem'ent 23 carried by member I9.

Movable die supporting member 21 is formed with a horizontal threaded bore 33 in which is threadedly engaged the end portion 34 of ahandle member 35. Rotatively secured to the end of por tion 34 is a C-shaped die carrier member 36. The lower arm of member 33 is grooved at 31, 31 to slidably interfit with longitudinal ribs 38, 38 formed in a longitudinal recess 39 provided for. said lower arm in main body portion 28 of the movable die supporting member. The upper arm of member 36 is slidably received in a longitudinal recess 40 formed at the bottom of top member 29. Secured in vertical position between the upper and lower arms of member 36 by a bearing bolt is a hardened roller member 42. Roller member 42 is formed with an arcuate groove 43 in its upper portion.

Slidably engaged with horizontal shaft 2| and dove-tailed lugs I4 and I5 is a movable jaw member 44. Jaw member 44 is formed with a longitudinal bore 45 which slidably fits shaft 2| and with a dovetail lower longitudinal lug 46 adapted to be slidably received between lugs l4 and I5. Jaw member 44 carries a hardened gripping jaw member 41 adapted to cooperate with shank 20 to grip a bar therebetween during the bending thereof. The opposite end of member 44 is formed with an annular flange 48 concentric with bore 45.

Threadedly engaged with the end portion 49 of member I9 is a feed handle 50 to which is secured a semi-cylindrical sleeve member formed with an internal groove overlying and engaged with flange 48 so that rotation of handle 50 will advance or retract jaw member M with respect to shank of die supporting member l9.

In operating the device a bar is positioned between jaw element 47 and shank 20 with the movable die supporting member 21 in the dotted position shown in Figure 1. Handle 5'5 is rotated so that the bar is tightly gripped between jaw element 41 and shank 20 and the handle then axially rotated until roller 32 comes into contact with the bar at groove 33. Movable die supporting member 21 is then rotated counter-clockwise inahorizo'ntal plane around member l9 by means of handle 35, as viewed in Figure 1, thus exerting bending force on the bar, with shank 2i! acting as the fulcrum.

For bending the bar to a desired radius of curvature,-a plurality of nested sleeve elements one of which is shown at 52 in Figure 12 may be provided. Each sleeve element is formed with a knurled gripping surface 53 and with a rounded bottom notch 54. The smallest sleeve has an inside diameter adapted to fit over shank 20 with its notch 54 receiving the adjacent portion of shaft '21. The next succeeding sleeve is formed with an inside'diameter adapted to fit over the first sleeve with its notch 54 receiving shaft Z I. By -employing successive sleeves, any desired bending radius within a substantial range may b obtained.

The sleeves are all of the same length except the "smallest sleeve which is shorter than the other sleeves'by the thickness of rib element 23 upon vvhich it 'is supported. The other sleeves encircle rib element 23 and rest on the adjacent horizontal surface of body portion 28.

Lug 14 of member H is formed with a pair of recesses '55, 55 adapted to receive the ends of the legs '55, '56 of a U-bo1t gauge member 51, shownin Figure 10. Gauge member 51 is in the form of a U-bolt and carries an adjustable stop member 58 slidably supported by sleeves 5'9, '59 on the legs 56, 56 of the U-bolt, and which may be set by means of thumb screws '65, 60 at a desired position with respect to shank 20. As shown in Figure 10, the U-bolt carries a scale of gauge markings forsetting the stop member at the proper distance for the particular length of u-ibolt which it'is desired to form in the bending device. 'As indicated in Figure the end of the. piece of bar stock BI is initially placed in abutment with stop member 58 for securing the bar between the gripping jaws of the device in the correct position for a desired length of U- bolt.

'Io form a'ring, a piece of bar stock is prepared of proper length for the ring desired and the bar is b'ent by a series of successive bending operations in the device until complete 360 bending is obtained.

While a specific embodiment of a bar bending device has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore it is intended that no limitations be placed on the invention other than as defined by the scope of the appended claims.

What is claimed is:

1. A bending device comprising a base adapted to be secured to a stationary support, jaw means mounted on said base, said jaw means comprising a stationary vertical fulcrum member formed with a horizontal shaft portion and a movable jaw slidably mounted on said horizontal shaft portion, cooperating guide means on said movable jaw and said base for guiding said movable jaw longitudinally with respect to said fulcrum member, jaw actuating means threadedly engaged with said horizontal shaft portion and engaging said movable jaw for moving said jaw with respect to said fulcrum member, a movable die supporting member p'rvotally secured to said fulcrum member for swinging movement in a horizontal plane, and a vertical roller carried by said movable die supporting. member, said vertical roller being formed andarranged to exert bending pressure on a 'bar placed within said jaw means responsive to swinging movement of said movable die supporting member around said fulcrum member.

2. The structure of claim and wherein a sleeve member is mounted-on said fulcrum memher, said sleeve member being formed with a lower notch adapted to receive said horizontal shaft portion.

3. A bending device, comprising a base, adapted to be secured to a stationary support, a vertical fulcrum fixed to said basaa horizontal arm" secured to said fulcrum, a movable jaw 'slidably mounted on said arm, means mounting said jaw on said 'base for horizontal sliding movement on said base toward said fulcrum for-gripping an article to be bent therebet'ween, "a bending =die pivoted on said fulcrum for bending an article tlierearound, a plurality of nested sleeve members sl-idabl'e onto and off of said fulcrum and each other to vary seleetively the diameter of said f-u-l'crum, said sleeves being formed with notches engageable with said arm for preventing relative rotation of said sleeves and fulcrum.

HARVEY W. ENGLISH.

REFERENCES CITED The following references areiof record in the file of this patent:

UNITED STATES PATENTS 

